Re: Flowbits config

[Peter Bates <peter.bates () ucl ac uk>]

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Hello all

On 22/10/2013 11:42, Anshuman Anil Deshmukh wrote:
> WARNING: 'ignore_any_rules' option for Stream5 UDP disabled because of UDP rule with flow or flowbits option.
>
> ICMP tracking disabled, no ICMP sessions allocated
>
> IP tracking disabled, no IP sessions allocated
>
> WARNING: flowbits key 'ET.BotccIP' is set but not ever checked.
>
> WARNING: flowbits key 'ET.RBN' is set but not ever checked.

These are just warnings - Snort will run.

They just mean (as the warning says) that a rule has defined
a flowbit but it is never tested by another rule.

For example, SID 28214 "EXPLOIT-KIT Neutrino exploit kit outbound request format"
includes
flowbits:set,file.exploit_kit.jar

SID 27816 "EXPLOIT-KIT Multiple exploit kit jar file download attempt" 
checks with
flowbits:isset,file.exploit_kit.jar

It's a way of maintaining state in checking rules.

The best advice is to use Pulledpork for flowbit resolution.

- -- 
Peter Bates
Senior Information Security Officer   Phone: +44(0)2076792049
Information Services Division         Internal Ext: 32049
University College London
London WC1E 6BT
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